50 lines
2.2 KiB
C#
50 lines
2.2 KiB
C#
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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namespace System.Threading
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{
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/// <summary>
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/// Overlapped subclass adding data needed by ThreadPoolBoundHandle.
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/// </summary>
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internal sealed class ThreadPoolBoundHandleOverlapped : Overlapped
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{
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private readonly IOCompletionCallback _userCallback;
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internal readonly object _userState;
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internal PreAllocatedOverlapped _preAllocated;
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internal unsafe NativeOverlapped* _nativeOverlapped;
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internal ThreadPoolBoundHandle _boundHandle;
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internal bool _completed;
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public unsafe ThreadPoolBoundHandleOverlapped(IOCompletionCallback callback, object state, object pinData, PreAllocatedOverlapped preAllocated)
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{
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_userCallback = callback;
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_userState = state;
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_preAllocated = preAllocated;
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_nativeOverlapped = Pack(CompletionCallback, pinData);
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_nativeOverlapped->OffsetLow = 0; // CLR reuses NativeOverlapped instances and does not reset these
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_nativeOverlapped->OffsetHigh = 0;
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}
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private unsafe static void CompletionCallback(uint errorCode, uint numBytes, NativeOverlapped* nativeOverlapped)
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{
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ThreadPoolBoundHandleOverlapped overlapped = (ThreadPoolBoundHandleOverlapped)Overlapped.Unpack(nativeOverlapped);
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//
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// The Win32 thread pool implementation of ThreadPoolBoundHandle does not permit reuse of NativeOverlapped
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// pointers without freeing them and allocating new a new one. We need to ensure that code using the CLR
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// ThreadPool implementation follows those rules.
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//
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if (overlapped._completed)
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throw new InvalidOperationException(SR.InvalidOperation_NativeOverlappedReused);
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overlapped._completed = true;
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if (overlapped._boundHandle == null)
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throw new InvalidOperationException(SR.Argument_NativeOverlappedAlreadyFree);
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overlapped._userCallback(errorCode, numBytes, nativeOverlapped);
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}
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}
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}
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